| 摘要 |
PURPOSE:To compensate the intrinsic magnetism of a car or the like without additional power source by fixing a ring magnet on the axis of rotation of a bearing meter using earth magnetism and attaching 2 coils whose axises meet at right angles in close vicinity to the ring magnet. CONSTITUTION:A double-pole ring magnet 30 is fixed on an axis 1 of rotation of a bearing meter which is attached to a car for example and uses earth magnetism, and two coils 31 and 32 whose axises meet at right angles are attached in close vicinity to the ring magnet 30. The axses of coils 31 and 32 are made consist with the horizontal and longitudinal directions. The compensating AC electromotive force obtained between center taps 37 and 38 is added to the AC electromotive force of a coil 4 for the measurement of horizontal component of earth magnetism to compensate the intrinsic magnetism of the car. Thus, the intrinsic magnetism of cars can be simply compensated without additional power source. |
